I don't see how this helps. What would be useful is for you (and your neighbors) to report the issue to the city and have them install speed bumps and maybe have a speed trap setup. Not everything needs an app.
What percentage of communities are rich suburbs that have more money and staff than they really have a use for.
And IMO just covering that small % of communities would satisfy 99% of people making these requests.
As much as I dislike the survelience aspects, police operated red-light and speed cameras are already a thing. An app isn't going to fix the problem that your police don't care.